chiark - git - mdw - catacomb/blob - karatsuba.h

   1 /* -*-c-*-
   2  *
   3  * $Id: karatsuba.h,v 1.3 2004/04/08 01:36:15 mdw Exp $
   4  *
   5  * Macros for Karatsuba functions
   6  *
   7  * (c) 2000 Straylight/Edgeware
   8  */
   9
  10 /*----- Licensing notice --------------------------------------------------*
  11  *
  12  * This file is part of Catacomb.
  13  *
  14  * Catacomb is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU Library General Public License as
  16  * published by the Free Software Foundation; either version 2 of the
  17  * License, or (at your option) any later version.
  18  *
  19  * Catacomb is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU Library General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU Library General Public
  25  * License along with Catacomb; if not, write to the Free
  26  * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
  27  * MA 02111-1307, USA.
  28  */
  29
  30 #ifndef CATACOMB_KARATSUBA_H
  31 #define CATACOMB_KARATSUBA_H
  32
  33 #ifdef __cplusplus
  34   extern "C" {
  35 #endif
  36
  37 /*----- Header files ------------------------------------------------------*/
  38
  39 #ifndef CATACOMB_MPW_H
  40 #  include "mpw.h"
  41 #endif
  42
  43 /*----- Normal arithmetic macros ------------------------------------------*/
  44
  45 #define UADD(dv, av, avl) do {                                          \
  46   mpw *_dv = (dv);                                                      \
  47   const mpw *_av = (av), *_avl = (avl);                                 \
  48   mpw _c = 0;                                                           \
  49                                                                         \
  50   while (_av < _avl) {                                                  \
  51     mpw _a, _b;                                                         \
  52     mpd _x;                                                             \
  53     _a = *_av++;                                                        \
  54     _b = *_dv;                                                          \
  55     _x = (mpd)_a + (mpd)_b + _c;                                        \
  56     *_dv++ = MPW(_x);                                                   \
  57     _c = _x >> MPW_BITS;                                                \
  58   }                                                                     \
  59   while (_c) {                                                          \
  60     mpd _x = (mpd)*_dv + (mpd)_c;                                       \
  61     *_dv++ = MPW(_x);                                                   \
  62     _c = _x >> MPW_BITS;                                                \
  63   }                                                                     \
  64 } while (0)
  65
  66 #define UADD2(dv, dvl, av, avl, bv, bvl) do {                           \
  67   mpw *_dv = (dv), *_dvl = (dvl);                                       \
  68   const mpw *_av = (av), *_avl = (avl);                                 \
  69   const mpw *_bv = (bv), *_bvl = (bvl);                                 \
  70   mpw _c = 0;                                                           \
  71                                                                         \
  72   while (_av < _avl || _bv < _bvl) {                                    \
  73     mpw _a, _b;                                                         \
  74     mpd _x;                                                             \
  75     _a = (_av < _avl) ? *_av++ : 0;                                     \
  76     _b = (_bv < _bvl) ? *_bv++ : 0;                                     \
  77     _x = (mpd)_a + (mpd)_b + _c;                                        \
  78     *_dv++ = MPW(_x);                                                   \
  79     _c = _x >> MPW_BITS;                                                \
  80   }                                                                     \
  81   *_dv++ = _c;                                                          \
  82   while (_dv < _dvl)                                                    \
  83     *_dv++ = 0;                                                         \
  84 } while (0)
  85
  86 #define USUB(dv, av, avl) do {                                          \
  87   mpw *_dv = (dv);                                                      \
  88   const mpw *_av = (av), *_avl = (avl);                                 \
  89   mpw _c = 0;                                                           \
  90                                                                         \
  91   while (_av < _avl) {                                                  \
  92     mpw _a, _b;                                                         \
  93     mpd _x;                                                             \
  94     _a = *_av++;                                                        \
  95     _b = *_dv;                                                          \
  96     _x = (mpd)_b - (mpd)_a - _c;                                        \
  97     *_dv++ = MPW(_x);                                                   \
  98     if (_x >> MPW_BITS)                                                 \
  99       _c = 1;                                                           \
 100     else                                                                \
 101       _c = 0;                                                           \
 102   }                                                                     \
 103   while (_c) {                                                          \
 104     mpd _x = (mpd)*_dv - (mpd)_c;                                       \
 105     *_dv++ = MPW(_x);                                                   \
 106     if (_x >> MPW_BITS)                                                 \
 107       _c = 1;                                                           \
 108     else                                                                \
 109       _c = 0;                                                           \
 110   }                                                                     \
 111 } while (0)
 112
 113 /*----- Binary polynomial arithmetic macros -------------------------------*/
 114
 115 #define UXOR(dv, av, avl) do {                                          \
 116   mpw *_dv = (dv);                                                      \
 117   const mpw *_av = (av), *_avl = (avl);                                 \
 118                                                                         \
 119   while (_av < _avl)                                                    \
 120     *_dv++ ^= *_av++;                                                   \
 121 } while (0)
 122
 123 #define UXOR2(dv, dvl, av, avl, bv, bvl) do {                           \
 124   mpw *_dv = (dv), *_dvl = (dvl);                                       \
 125   const mpw *_av = (av), *_avl = (avl);                                 \
 126   const mpw *_bv = (bv), *_bvl = (bvl);                                 \
 127                                                                         \
 128   while (_av < _avl || _bv < _bvl) {                                    \
 129     mpw _a, _b;                                                         \
 130     _a = (_av < _avl) ? *_av++ : 0;                                     \
 131     _b = (_bv < _bvl) ? *_bv++ : 0;                                     \
 132     *_dv++ = _a ^ _b;                                                   \
 133   }                                                                     \
 134   while (_dv < _dvl)                                                    \
 135     *_dv++ = 0;                                                         \
 136 } while (0)
 137
 138 /*----- That's all, folks -------------------------------------------------*/
 139
 140 #ifdef __cplusplus
 141   }
 142 #endif
 143
 144 #endif